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Unformatted text preview: 12 0.77 54112.554 Ed=Fd/Fde 0.8738977 Max pull 1.6 Ratings w/ SF S.F. 2 Ldemax 500000 250000 Tmax 51200 25600 Tdpmax 396000 198000 n 8 E 0.841 How hard can the driller pull on stuck drill pipe Wmax assuming the derrick is the limiting factor is 166666.67 lbf If the drilling line is the limiting factor, the tension in the fast line would be used to calculate the maximum hook load Tfast W/En Wmax TfastEn Wmax 344473.6 lbf If the drill pipe is the limiting factor, the max hook load will be 1/2 of the tension rating of the DP Wmax 198000 The actual limiting factor is the lower of the three In this case the derrick is the limiting factor Wmax 166,667 lbf + × = + = 4 F W W for 4 de n n Solve W n n F Since de...
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